[MacPorts] #66050: p7zip does not install when building for 10.12 SDK due to missing Corefoundation.h

[MacPorts]

#66050: p7zip does not install when building for 10.12 SDK due to missing
Corefoundation.h
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  Reporter:  lukaso  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Changes (by lukaso):

 * Attachment "main.log" added.

 Failing build.

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Ticket URL: <https://trac.macports.org/ticket/66050>
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